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The Polymer 2 version is not used anymore, therefore no auto-generation
is necessary and the v3 version can be directly checked in.

Fixed: 1042545
Change-Id: I5054477c0b7427f4ec6b760e5da3eac904af2320
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003114
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732590}